git-pull.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5 # Fetch one or more remote refs and merge it/them into the current HEAD.
   6
   7 USAGE='[-n | --no-summary] [--no-commit] [-s strategy]... [<fetch-options>] <repo> <head>...'
   8 LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
   9 . git-sh-setup
  10
  11 strategy_args= no_summary= no_commit=
  12 while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
  13 do
  14         case "$1" in
  15         -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
  16                 --no-summa|--no-summar|--no-summary)
  17                 no_summary=-n ;;
  18         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  19                 no_commit=--no-commit ;;
  20         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  21                 --strateg=*|--strategy=*|\
  22         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  23                 case "$#,$1" in
  24                 *,*=*)
  25                         strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
  26                 1,*)
  27                         usage ;;
  28                 *)
  29                         strategy="$2"
  30                         shift ;;
  31                 esac
  32                 strategy_args="${strategy_args}-s $strategy "
  33                 ;;
  34         -h|--h|--he|--hel|--help)
  35                 usage
  36                 ;;
  37         -*)
  38                 # Pass thru anything that is meant for fetch.
  39                 break
  40                 ;;
  41         esac
  42         shift
  43 done
  44
  45 orig_head=$(git-rev-parse --verify HEAD) || die "Pulling into a black hole?"
  46 git-fetch --update-head-ok "$@" || exit 1
  47
  48 curr_head=$(git-rev-parse --verify HEAD)
  49 if test "$curr_head" != "$orig_head"
  50 then
  51         # The fetch involved updating the current branch.
  52
  53         # The working tree and the index file is still based on the
  54         # $orig_head commit, but we are merging into $curr_head.
  55         # First update the working tree to match $curr_head.
  56
  57         echo >&2 "Warning: fetch updated the current branch head."
  58         echo >&2 "Warning: fast forwarding your working tree from"
  59         echo >&2 "Warning: $orig_head commit."
  60         git-update-index --refresh 2>/dev/null
  61         git-read-tree -u -m "$orig_head" "$curr_head" ||
  62                 die 'Cannot fast-forward your working tree.
  63 After making sure that you saved anything precious from
  64 $ git diff '$orig_head'
  65 output, run
  66 $ git reset --hard
  67 to recover.'
  68
  69 fi
  70
  71 merge_head=$(sed -e '/  not-for-merge   /d' \
  72         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
  73         tr '\012' ' ')
  74
  75 case "$merge_head" in
  76 '')
  77         echo >&2 "No changes."
  78         exit 0
  79         ;;
  80 ?*' '?*)
  81         var=`git-repo-config --get pull.octopus`
  82         if test -n "$var"
  83         then
  84                 strategy_default_args="-s $var"
  85         fi
  86         ;;
  87 *)
  88         var=`git-repo-config --get pull.twohead`
  89         if test -n "$var"
  90         then
  91                 strategy_default_args="-s $var"
  92         fi
  93         ;;
  94 esac
  95
  96 case "$strategy_args" in
  97 '')
  98         strategy_args=$strategy_default_args
  99         ;;
 100 esac
 101
 102 merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD")
 103 git-merge $no_summary $no_commit $strategy_args "$merge_name" HEAD $merge_head